Kidneys and excretion
this is a course focusing on the kidneys for GCSE combined science . enjoy :)
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16 questions
| 🇬🇧 | 🇬🇧 |
| What is meant by excretion? | The process of ridding the body of waste products |
| Name three waste products of metabolism | Carbon dioxide, water, urea |
| What are the two functions of the kidneys? | To get rid of waste (urea) and to regulate levels of other substances (water and ions) |
| What is deamination? | The process of forming urea in the liver from excess amino acids |
| What happens if you have too high or low levels of ions? | It can damage your cells |
| What happens if you have too high or low levels of water | - too high levels can cause your cells to swell and burst - too low levels can cause your cells to lose water and shrink |
| What are three ways we lose water? | Via the skin (sweating) via the lungs (breathing) and via the kidneys (urinating) |
| What is the function of tubules? | To absorb small molecules and reabsorb useful molecules back into the bloodstream |
| What are examples of things that tubules will reabsorb into the bloodstream? | Glucose (always), water and ions (sometimes) |
| What is the process that the tubules carry out called? | Selective reabsorbtion |
| What is the function of the hypothalmus? | To detect water concentration. |
| What does the hypothalmus do if water levels are too low, and what is the result of this action? | The hypothalmus sends a signal to the pituitary gland to release a hormone called ADH. ADH will encourage water to be reabsorbed in the kidneys less urine will be produced |
| What does the hypothalmus do if water levels in the body are too high? | No signals will be sent to the pituitary gland less ADH will be produced less water will be absorbed by the kidneys more urine will be produced |
| What is the process of water regulation an example of? | A negative feedback loop |